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Gradient coil design method based on minimum VRMS error

A technology of gradient coils and design methods, applied in calculation, special data processing applications, instruments, etc., can solve problems such as the inability to guarantee the minimum linear error

Active Publication Date: 2015-12-30
HOHAI UNIV
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Problems solved by technology

The disadvantage of this is that the algorithm only guarantees the minimum linear error at the sampling point, but cannot guarantee the minimum linear error in the entire imaging area

Method used

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  • Gradient coil design method based on minimum VRMS error
  • Gradient coil design method based on minimum VRMS error
  • Gradient coil design method based on minimum VRMS error

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0048] This invention is supported by the Youth Fund Project of the Natural Science Foundation of Jiangsu Province (Project Approval Number: BK20130854).

[0049] Such as figure 1 As shown, a gradient coil design method based on the minimum VRMS error includes the following steps:

[0050] Step 1, the size of the frame where the gradient coil is located and the preset parameters are given in advance;

[0051] Preset parameters include imaging area range, gradient field strength and VRMS error E vrms ;

[0052] VRMS error E vrms for,

[0053] E v r m s = [ ...

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Abstract

The invention discloses a gradient coil design method based on the minimum VRMS error. The method is characterized in that the design of gradient coils meets the functional minimum consisting of the square of the VRMS linear errors and the weighted sum of coil stored energy. The invention further provides an algorithm flow for designing the gradient coils on the basis of the minimum VRMS linear error. For a spherical imaging area, harmonic coefficient expansion is adopted for calculation of VRMS errors, and the efficiency and precision are very high. The method is applicable to design of any existing types of gradient coils such as cylindrical gradient coils, panel gradient coils, irregular gradient coils and the like.

Description

technical field [0001] The invention relates to a gradient coil design method based on minimum VRMS error, which belongs to the field of nuclear magnetic resonance imaging system component design. Background technique [0002] Whether it is a permanent magnet MRI or a superconducting MRI, the core key component is the gradient coil. The criteria for measuring the performance of gradient coils mainly include field strength, linearity, switching rate, etc. The design of the gradient coil is mainly to take these three indicators into consideration. The current mainstream gradient coil design algorithm mostly takes a series of sampling points in the imaging area or surface, and then weights the square sum of the error between the gradient field at the sampling point and the ideal gradient field and the sum of the coil energy storage. minimum. The disadvantage of this is that the algorithm only guarantees the minimum linear error at the sampling point, but cannot guarantee the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 平学伟殷兴辉李黎李昌利刘海韵
Owner HOHAI UNIV
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